Thirteen minutes is a fair amount of time, although you certainly need a prepared course of action so that you can maximize the time. It is, of course, effectively much shorter if you are responsible for others. As one who has to be prepped for earthquakes, I am somewhat envious.

Consider that tornadoes do not spring out of nowhere, at least with current forecasting techniques.There is still a threat today. I would be wearing sturdy shoes and be in condition red or close to it, if I were in the affected region.